Lua APA (7ú heag.)
Humboldt, W., Buch, G. C., & Raven, F. A. Linguistic variability: Intellectual development.
Lua i Stíl Chicago (17ú heag.)
Humboldt, Wilhelm, George C. Buch, agus Frithjof A. Raven. Linguistic Variability: Intellectual Development.
Lua MLA (9ú heag.)
Humboldt, Wilhelm, et al. Linguistic Variability: Intellectual Development.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.